Laboratory Conductivity Meter - Camlab · PDF file2 HACH Company Trademarks AccuGrow®...

Cat. No. 54500-18

LaboratoryConductivity Meter

© Hach Company, 1999, 2000. All rights reserved. Printed in the U.S.A. jnb/dk 9/00 1ed Rev1

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2

TABLE OF CONTENTS

SAFETY PRECAUTIONS ....................................................................................................... 5SPECIFICATIONS.................................................................................................................... 7

OPERATION ..........................................................................................................................9

SECTION 1 INTRODUCTION ...................................................................................... 111.1 Unpacking the Instrument ................................................................................................. 12

1.1.1 Standard Accessories ............................................................................................... 121.2 Keypad Description........................................................................................................... 131.3 Display Fields and Icons ................................................................................................... 151.4 Audible Signals ................................................................................................................. 17

SECTION 2 INSTRUMENT SETUP ............................................................................ 192.1 Instrument Description...................................................................................................... 192.2 Power Connections............................................................................................................ 192.3 Conductivity Probe Connection ........................................................................................ 202.4 Printer and Computer Connections ................................................................................... 20

SECTION 3 INSTRUMENT OPERATION ................................................................ 213.1 Setup Menu ....................................................................................................................... 21

3.1.1 Turning Display Lock Off and On........................................................................... 213.1.2 Selecting Temperature Units.................................................................................... 223.1.3 Turning Temperature Correction Off and On .......................................................... 223.1.4 Entering a Temperature Correction Value ............................................................... 233.1.5 Entering a TDS Correction Factor ........................................................................... 243.1.6 Selecting a Reference Temperature ......................................................................... 253.1.7 Setting the Time....................................................................................................... 263.1.8 Setting the Month and Day ...................................................................................... 263.1.9 Setting the Year........................................................................................................ 273.1.10 Automatic Data Transfer ....................................................................................... 27

3.2 Calibrating the Meter ........................................................................................................ 293.2.1 Calibrating with a Known Standard......................................................................... 293.2.2 Calibrating by Adjusting the Cell Constant............................................................. 30

3.3 Reviewing Calibrations ..................................................................................................... 313.4 Measuring Total Dissolved Solids..................................................................................... 313.5 Measuring Salinity ............................................................................................................ 313.6 Measuring Conductivity .................................................................................................... 32

3.6.1 Measuring Low Levels of Conductivity .................................................................. 32

3

TABLE OF CONTENTS, continued

3.7 Operational Notes ............................................................................................................. 333.8 Common Conversion Factors............................................................................................ 343.9 Theory of Operation.......................................................................................................... 34

SECTION 4 STORING AND RECALLING DATA.................................................. 374.1 Storing Measurements ...................................................................................................... 374.2 Recalling Stored Data ....................................................................................................... 384.3 Erasing Data...................................................................................................................... 38

4.3.1 Erasing Single Data Points ...................................................................................... 384.3.2 Erasing All Data Points ........................................................................................... 39

SECTION 5 MAINTENANCE ....................................................................................... 415.1 Cleaning the Probe............................................................................................................ 415.2 Meter Maintenance ........................................................................................................... 41

SECTION 6 PRINTING/TRANSFERRING DATA .................................................. 436.1 Connecting to Printers/Computers.................................................................................... 43

6.1.1 Connecting with the RS232 Cable .......................................................................... 436.1.2 Connecting to a Printer............................................................................................ 436.1.3 Connecting to a Personal Computer........................................................................ 44

6.2 Sending Data to Printers/Computers................................................................................. 466.2.1 Sending Currently Displayed Data.......................................................................... 466.2.2 Sending Recalled Data Points ................................................................................. 466.2.3 Sending All Stored Data.......................................................................................... 47

SECTION 7 TROUBLESHOOTING............................................................................ 497.1 Introduction....................................................................................................................... 497.2 Error Codes ....................................................................................................................... 497.3 Meter Service Request Questionnaire............................................................................... 50

GENERAL INFORMATION........................................................................................... 51REPLACEMENT PARTS....................................................................................................... 53HOW TO ORDER .................................................................................................................. 54REPAIR SERVICE ................................................................................................................. 55WARRANTY.......................................................................................................................... 56CERTIFICATION................................................................................................................... 57

4

SAFETY PRECAUTIONS

Section 2.2 Power Connections

Section 2.3 Conductivity Probe Connection

Section 2.4 Printer and Computer Connections

Section 6.1 Connecting to Printers/Computers

5

6

SPECIFICATIONS

Specifications subject to change without notice.

Measurement Range:Conductivity Range 0–19.99 µS; 20–199.9 µS/cm;

200–1999 µS/cm;2–19.99 mS/cm; 20–199.9mS/cm

TDS 0–50,000 mg/L as NaClSalinity 0–42 ppt (‰)Temperature -10 to 105 °C

Resolution:Conductivity:0.00–19.99 µS/cm 0.01 µS/cm20.0–199.9 µS/cm 0.1 µS/cm200–1999 µS/cm 1 µS/cm2.00–19.99 mS/cm 0.01 mS/cm20.0–199.9 mS/cm 0.1 mS/cm

TDS:0.00–199.9 mg/L 0.1 mg/L200–1999 mg/L 1 mg/L2.00–19.99 g/L 0.01 g/L20.0–50 g/L 0.1 g/L

Salinity 0.1 pptTemperature ±0.1 °C

Accuracy:Conductivity ±0.5% of rangeTDS ±0.5% of full scaleSalinity ±0.1 ppt (-2 to 35 °C)Temperature ±0.3 °C from 0–70 °C

±1.0 °C >70–110 °C

Conversion Factor for TDS: automatic or user adjustable

Temperature Compensation:Manual (user selected coefficient, % per °C) orAutomatic (non-linear based on NaCl solutions)

Display: Custom LCD

7

SPECIFICATIONS, continued

Inputs: 5 pin (with temperature); line power

Outputs: One-way RS232

Power Requirements: 6–12 V dc; use either Hach-supplied 115or 230V, 50/60 Hz external power supply or a customer-providedsupply with 50 mA output, 5.5-mm power plug with a 2.5-mmcenter post opening.

Installation Category: II

Instrument Drift: <40 µV/°C

Input Bias Current: <±1 picoamp at 25 °C; ±4 picoamp overfull range

Environmental Requirements: 0 to 50 °C at 85% non-condensing relative humidity

Dimensions: 15 x 25.4 x 8.37 cm (10.15 x 6 x 3.5 in.)

Enclosure: Water resistant (IP32), chemical resistant.

8

OPERATION

9

DANGERHandling chemical samples, standards, and reagents can be dangerous. Review the necessaryMaterial Safety Data Sheets and become familiar with all safety procedures before handlingany chemicals.

DANGERLa manipulation des échantillons chimiques, étalons et réactifs peut être dangereuse. Lire les Fichesde Données de Sécurité des Produits (FDSP) et se familiariser avec toutes les procédures de sécuritéavant de manipuler tous les produits chimiques.

PELIGROLa manipulación de muestras químicas, estándares y reactivos puede ser peligrosa. Revise las fichasde seguridad de materiales y familiarícese con los procedimientos de seguridad antes de manipularproductos químicos.

GEFAHRDas Arbeiten mit chemischen Proben, Standards und Reagenzien ist mit Gefahren verbunden.Es wird dem Benutzer dieser Produkte empfohlen, sich vor der Arbeit mit sicheren Verfahrensweisenund dem richtigen Gebrauch der Chemikalien vertraut zu machen und alle entsprechendenMaterialsicherheitsdatenblätter aufmerksam zu lesen.

PERIGOA manipulação de amostras, padrões e reagentes químicos pode ser perigosa. Reveja a folha dosdados de segurança do material e familiarize-se com todos os procedimentos de segurança antesde manipular quaisquer produtos químicos.

10

SECTION 1 INTRODUCTION

The sension™7 Conductivity Meter (Figure 1) features a customdigital LCD display that simultaneously displays temperature andmeasurement results. This meter is splashproof and featuresdatalogging and RS232 communication for printing results to acomputer or printer.

Figure 1 sension7 Conductivity Meter

The meter can be used for a wide variety of applications in thelaboratory. Stream samples, saline waters, acids, bases, and otheraqueous samples can be easily analyzed for conductivity with theavailable conductivity probes.

The meter microprocessor automates complicated and time-consuming calibration and measurement procedures for manyapplications. The direct calibration technique allows calibrationby entering actual calibration standard values, eliminatingrepeated adjustments of cell constants. Conductivity standards,TDS standards, and accessories are available.

Conductivity

sal5

TDS6

READenterexit

store8

print1

recall7

erase9

time3

setupCE

cal0

cond4

2

review

sension7

11

SECTION 1, continued

The meter is designed to be maintenance-free. If the meter getsdirty, wipe the surface with a damp cloth. Use a cotton-tippedapplicator to clean or dry the connectors if they get wet.

1.1 Unpacking the InstrumentRemove the instrument and accessories from the shippingcontainer and inspect each item for any damage that may haveoccurred during shipping. Verify that all items listed on thepacking slip are included. If any items are missing or damaged,contact Hach Customer Service, Loveland, Colorado forinstructions. Hach’s toll free phone number for customers withinthe United States is 800-227-4224. For customers outside theUnited States, contact the Hach office or distributor serving you.

1.1.1 Standard Accessories

• Instrument Manual

• Conductivity probe (K = 0.5 ±10%)

• Conductivity standard (1000 µS/cm)

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1.2 Keypad DescriptionFigure 2 illustrates the meter’s keypad. The description andfunction of each key are given in Table 1.

Figure 2 sension7 Meter Keypad

Table 1 Keys and Description

Key Description

Exit/Power On-Off Turns the instrument on; turns it off from a Reading mode.

Acts as a No or Cancel key when the question mark icon is illuminated.

In Setup mode, backs up one step toward the Reading mode.

Performs the following and returns to the most recent Reading mode:

• Exits the Store, Erase, or Recall mode• Aborts a calibration• Exits a calibration review

Arrow Keys Scroll between options in Setup mode.

Scroll through data points in Store and Recall modes.

Scroll between the option to print or erase one data point and all data points.

13


READ/enter Key Accepts numerical input.

Acts as a “YES” answer when the question mark is flashing.

Allows user to edit a setup when the setup number is flashing.

Accepts the current setup option when that option is flashing.

Initiates a new measurement when the meter has stabilized in the Display LockEnabled mode.

Recall Key Recalls stored sample data (from Reading mode only).

Store Key Stores the current (displayed) measurement (from Reading mode only).

Erase Key Erases recalled data points.

Cond Displays sample conductivity in Read or Recall mode.

Sal Displays sample salinity in Read or Recall mode.

TDS Displays estimated Total Dissolved Solids in Read or Recall mode.

Print Key Sends current or recalled data to a printer or a computer via the RS232 port.

Time Key In Reading mode, allows user to view the current time and date. In Recall Dataand Calibration Review modes, it toggles between the time and date of the storedmeasurement.

Cal Key Enters Calibration mode (from Reading mode only).

Review Key Enters Calibration Review mode (from Reading mode only).

Setup/CE Key Enters Setup mode (from Reading mode only) or clears a numeric entry when thekeypad icon is displayed.

Table 1 Keys and Description (Continued)

Key Description

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1.3 Display Fields and IconsThe display has two screens. The upper screen displaysmeasurements or standard values, the operation mode in use,sample temperature, error codes, and meter reading stability. Thelower screen displays the active keys.

Figure 3 shows the icons and screens displayed by the meter andTable 2 describes each element. All icons on the display will bedisplayed if the power key is held down for several seconds.

Figure 3 Display Elements

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Table 2 Main Display Elements

Item No. Description

1 Indicates that the meter is in Calibration mode. If the ? is flashing, calibration is necessary.

2 Indicates that the meter is in Calibration Review mode.

3 Indicates data is being sent to a printer/computer.

4 Indicates that recalled data that is currently displayed is being erased.

5 Indicates that the meter is in Setup mode.

6 Indicates that all data points are being printed or erased.

7 Numerical field that displays Setup, Sample, and Standard numbers when those words aredisplayed to the left of the number. If Standard is displayed, the meter is measuring acalibration standard.

8 Flashing ? and CAL indicate calibration is necessary. Also a prompt to press the ENTER orEXIT key.

9 Indicates that the meter is displaying recalled data.

10 Indicates that the meter is displaying or measuring a calibration standard.

11 NA

12 Numerical field that displays the measured value of standards and samples.

13 Indicates measurement units.

14 When Default is displayed, the meter is using the default temperature value to calculate thetemperature correction for the pH value.

15 Temperature units (choice of °C or °F).

16 NA

17 Numerical field that displays temperature value.

18 NA

19 Indicates that an inactive key has been pressed and that function is not allowed.

20 Indicates that the ENTER key is active.

21 Indicates that the arrow keys are active.

22 In Setup mode, it indicates that the date is being set.

23 Indicates that the displayed value is salinity.

24 Indicates the EXIT key is active.

25 When seen with the (OFF) icon, the temperature compensation is not being used.

26 Indicates that the numeric part of the keys is active.

27 Indicates displayed value is TDS.

28 Display Lock icon. Displayed with item 29.

29 Indicates whether Display Lock or Temperature Compensation setting is On or Off.

30 Faulty probe connection or incorrect probe attached. Usually displayed with an error code.

31 NA

16


1.4 Audible SignalsThe meter will beep under certain conditions:

• When a non-functional key press is made (one beep)

• When display lock is enabled and when measurementstability is reached during reading mode (three beeps)

• Any time measurement stability is reached during calibrationmode, regardless of the Display Lock setting

32 Indicates a meter function problem.

33 Flashing word indicates the signal from the sample is not yet stable. When it quits flashing,the reading is stable and may be recorded.

34 Used with ? icon. Asks if the user wants to store the displayed sample data or thecalibration that has been just completed.

35 Used with large display to indicate that the time is being set.

36 Indicates that the meter is in recall mode and that the data displayed is stored data.

Table 2 Main Display Elements (Continued)

Item No. Description

17

18

SECTION 2 INSTRUMENT SETUP

2.1 Instrument DescriptionThis sension™7 Laboratory Conductivity meter is designed forlaboratory use and operates on 115/230 V ac power.

The meter measures from 0 µS to 199.9 mS/cm, 0 to 50.0 g/LTDS, 0 to 42 g/L salinity, and the sample temperature. Displayedvalues are temperature corrected using the measured sampletemperature. To display conductivity, TDS, and salinity values,press the COND, TDS, and SAL keys, respectively.

2.2 Power ConnectionsA 115 or 230 V ac pin adapter connects the meter to line power.Plug the pin end of the adapter into the pin connector in the meter(see Figure 4). Then plug the adapter into the outlet.

Figure 4

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2.3 Conductivity Probe ConnectionConnect the probe with 5-pin connectors to the meter input bylining the pins up with the holes in the meter port (see Figure 5).Push toward the instrument.

Figure 5 sension7 Probe Connection

2.4 Printer and Computer ConnectionsThe meter can send data to a computer or printer via the 9-pinserial port. The printer cable and computer cable aredifferent. The printer cable (Cat. No. 49503-00) is a 9-pin to25-pin cable and the computer cable (Cat. No. 48129-00) is a9-pin to 9-pin cable. Be sure to use the correct cable.

The meter can print to serial printers without an adapter. Forparallel printers, a converter and cable adapter are required. TheCitizen PN60 printer (Cat. No. 26687-00) requires a specialCitizen adapter (supplied with the printer). Pressing the PRINTkey will send the currently displayed data to the printer. The datamay be either a current measurement or recalled data.

To send data to a computer, connect the 9-pin serial port on themeter to a 9-pin serial port of the computer. Press the PRINT keyto send the currently displayed data to the computer. The datamay be either a current measurement or recalled data.

20

SECTION 3 INSTRUMENT OPERATION

3.1 Setup MenuThe sension™7 Laboratory Conductivity meter setup menuallows the analyst to choose options for display lock, temperatureunits, time, date, temperature correction factor, TDS calculationfactor, and reference temperature.

To access the Setup menu, press the SETUP key. The arrow iconswill be displayed, indicating that additional options are availablewithin the menu. Press the up or down arrow key to scroll thedesired option, then press ENTER.

When using the Setup menu, the screen will display a number inthe upper right numerical field, indicating which option is beingchanged. Table 3 describes these options.

3.1.1 Turning Display Lock Off and OnSetup 1 is the Display Lock option. This feature stopsmeasurement reading fluctuation on the display once a stablereading is reached. The default setting is On.

When this feature is not used, the measurement value maycontinue to fluctuate and Stabilizing... will be displayed.

1. From the reading mode, press SETUP.

2. The Setup icon and the number 1 (flashing) will be displayed.Change the Display Lock status by pressing ENTER; this

Table 3 sension7 Setup Options

SetupNumber

Description

1 Display lock (On or Off)

2 Temperature units (°C or °F)

3 Temperature Correction (conductivity only) (On or Off)

4 Temperature Correction Factor

5 TDS Correction Factor

6 Reference Temperature Selection (20 or 25 °C)

7 Time of day (24 hour clock)

8 Date (mm/dd)

9 Year (four digits)

10 Timed print function

21


toggles the setting between off and on. When the setting isdisabled, the Display Lock icon and Off are displayed. Whenthis feature is enabled, the Display Lock icon is displayedwithout Off

3. When the desired option is selected, press EXIT to return tothe reading mode or an arrow key to scroll to other setups.

3.1.2 Selecting Temperature Units


2. The Setup icon and the number 1 (flashing) will be displayed.Press the up arrow once so the Setup number is 2.

3. Change the temperature unit by pressing ENTER; this keytoggles the temperature units between °C and °F. Thedefault is °C.


3.1.3 Turning Temperature Correction Off and OnBecause the activity of ions in solutions varies with temperature,conductivity measurements are typically corrected for the sampletemperature. To obtain conductivity measurements that are nottemperature corrected (i.e., using the soil cup), turn this optionoff. For typical measurements, ignoring the effects of temperaturecan result in significant error. Salinity and TDS always requiretemperature compensation. The probe supplied with the metermeasures temperature with a thermistor for automatictemperature compensation.


2. The Setup icon and the number 1 (flashing) will be displayed.Press the up arrow until the Setup number is 3.

3. Change the temperature correction status by pressing ENTER;this toggles the setting between off and on. When the settingis disabled, the thermometer icon and Off are displayed.When this feature is enabled, the thermometer icon isdisplayed without the Off icon.

22


Note: When the thermometer and Off icons appear in the Read mode,the instrument is not correcting the measured conductivityfor temperature.

4. Press EXIT to return to the reading mode or an arrow key toscroll to other setups.

Note: Salinity and TDS measurements always use temperature-compensated conductivity readings even if this feature has beenturned off.

3.1.4 Entering a Temperature Correction ValueThis feature allows selection of a linear or non-linear temperaturecorrection function. The non-linear coefficient has beendetermined from measurements using aqueous NaCl solutions. Ifthe linear function is chosen, the measured conductivity valuesare automatically temperature-corrected based on the enteredtemperature coefficient and the selected reference temperature.The linear temperature correction value for the meter has adefault value of 2% per 1 °C.

Conductivity of samples which contain other salts or ions maychange at a different rate with temperature. This rate depends onthe solution temperature, the ion concentration, and the referencetemperature selected, and should be determined experimentally.Once determined, enter the temperature correction value usingthis setup option.

The Temperature Correction option must be on for the meter touse a temperature correction value (see Section 3.1.3).



3. Change the temperature correction value by pressing ENTER.

Note: If the linear function is currently active, the temperature correctioncoefficient will appear in the display (i.e., 2.000%). If the non-linearfunction is active, then NaCl will appear in the display.

4. The ? icon and the flashing NaCl will appear. If the linearfunction is active, go to step 5. If the linear function is notactive, press the up arrow key.

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5. The main display will show the current value. The numerickeypad will become active.

6. Enter the desired value using the keypad. Once a number keyis pressed, the next digit place holder will flash. Continue toenter the desired numbers. Press ENTER to accept the value. Ifan number entry error occurs, start over by pressing theCE key.

Note: If the compensation factor is set to 0.00%, the conductivityreadings will not be corrected for temperature.


Table 4 shows some typical temperature coefficients.

3.1.5 Entering a TDS Correction FactorThis setup lets the user choose a linear or non-linear conversionfrom conductivity to TDS. TDS measurements use conductivityreadings that are temperature-compensated. When the linearconversion is chosen, the meter uses the reference temperature(see Section 3.1.6) and the temperature-correction option chosenin Section 3.1.4 to determine temperature-corrected conductivity.The non-linear (NaCl) conversion uses the non-linear temperaturecorrection function and a reference temperature of 25 °C toconvert temperature-compensated conductivity readings toTDS readings.


Table 4 Percentage Change of Conductivity per Degree C

Solution Percent/°C

Ultrapure Water 4.55

Salt (NaCl) 2.125

NaOH 1.72

Dilute Ammonia 1.8810

10% HCl 1.325

5% Sulfuric Acid 0.9698

Sugar Syrup 5.64

24



3. If the linear TDS conversion is active, the conversioncoefficient will appear in the display (e.g., 0.500). If thenon-linear TDS conversion is active, then NaCl will appear.

4. To change the conversion type, press ENTER. A ? will appearnext to the 5.

5. Press an arrow key to toggle between linear and non-linearconversion. To choose a non-linear conversion, scroll until aflashing NaCl appears, then press ENTER.

Note: In Reading Mode, the TDS icon indicates the meter is using thedefault non-linear conversion.

6. To select a linear conversion, scroll until the conversion factorappears. Use the numeric keypad to set the value of the factor,then press ENTER. If an number entry error occurs, start overby pressing the CE key.


3.1.6 Selecting a Reference TemperatureWhen measuring solutions that are not at the referencetemperature, the meter automatically adjusts the reading to theconductivity value that would have been measured if the samplehad been at the reference temperature. The reference temperaturechoices are 20 or 25 °C.



3. Change the reference temperature unit by pressing ENTER;this key toggles the temperature units between 20 °Cand 25 °C. The default is 25 °C.


25


3.1.7 Setting the Time



3. Change the time by pressing ENTER. The main display willchange to _ _:_ _, with the left place holder flashing. Thenumeric keypad will become active.

4. Press the desired number key for the left-most digit. Themeter uses a 24-hour military clock (12 a.m. = 00:00;1 p.m. = 13:00). All four digit places must have a number. Ifthe left-most digit(s) is not necessary, use zero for the value(i.e., 08:00 for 8 a.m or 00:30 for12:30 a.m.).

5. Once a number key is pressed, the next digit place holder willflash. Continue to enter the desired numbers until all fourplaces have a value. Press ENTER. If a number entry erroroccurs, start over by pressing the CE key.


3.1.8 Setting the Month and Day



3. Change the date by pressing ENTER. The numeric display willchange to _ _/_ _, with the left place holder flashing. The dateformat has two places for the month on the left side of theslash and two places for the day of the month on the right sideof the slash.

4. The numeric keypad will become active. Press the desirednumber key for the left-most digit. All four digit places musthave a number. If the left-most digit is not necessary, use zerofor the value (i.e., 02/06 is February 6).

26


5. Once a number key is pressed, the next digit place holder willflash. Continue to enter the desired numbers until all fourplaces have a value. Press ENTER. If an number entry erroroccurs, start over by pressing the CE key.


3.1.9 Setting the Year



3. Change the year by pressing ENTER. The main display willchange to _ _ _ _, with the left place holder flashing. Thenumerical keypad will become active.

4. Press the desired number key for the left-most digit. Once anumber key is pressed, the next digit place holder will flash.Continue to enter the desired numbers until all four placeshave a value. Press ENTER to accept the value. If an numberentry error occurs, start over by pressing the CE key.


3.1.10 Automatic Data TransferThis setup feature activates the meter’s automatic data transfer(Print) function. The automatic data transfer functionautomatically sends data through the RS232C depending uponthe time interval selected. Time intervals are selected from thefollowing options: 10 seconds, 30 seconds, 1 minute, 5 minutes,20 minutes, 1 hour, 2 hours, or 6 hours.

Accessing the calibration mode or the setup mode halts automaticdata transfer. Also, if the meter has been set to the Lock modeusing setup 1, the meter will not send data. When the meter is inLock mode and the READ key is pressed, automatic data transferwill occur at selected time intervals only until the meter stabilizesand the value in the display is locked.

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To change the automatic data transfer setup:

1. Press the SETUP key.

2. Press the up arrow nine times. A 10 will begin flashing in theupper right hand corner of the display. The current automaticdata transfer entry will be displayed.

3. Press the EXIT key to leave the value unchanged. To changethe value, press the ENTER key. The flashing question markwill appear in the upper right corner of the display next to the10. Use the arrow keys to view the time intervals forautomatic data transfer.

4. Press the ENTER key and then the EXIT key when the desiredautomatic data transfer time interval appears in the display.The meter will return to the Reading mode.

Each time data transfer occurs, the Print icon will momentarilyappear at the top of the display.

To turn off automatic data transfer:

1. Access setup 10 as described above.

2. Press the ENTER key.

3. When the question mark is flashing next to the 10, press thedown arrow until (off) appears in the display.

4. Press the ENTER key.

5. Press the EXIT key. The meter will return to the Reading modeand automatic data transfer will no longer occur.

28


3.2 Calibrating the MeterThe meter must be calibrated before use. There are two ways tocalibrate the meter:

• Using NaCl standards with known electrolytic conductivity.The meter is factory-set for use with a NaCl standard havingconductivity of 1000 µS/cm at 25 °C or a NaCl standardhaving conductivity of 18 mS/cm at 25 °C. In addition,conductivity of other standards may be entered via thekeypad. The meter will use the non-linear temperaturecoefficient to correct the measurement during calibration.

If using standards that are not sodium chloride-based (i.e, the53 mS/cm standard), calibrate as closely to 25 °C as possiblefor best accuracy.

• Entering/adjusting the cell constant of the conductivity probe.

Each method is described in the following sections.

3.2.1 Calibrating with a Known Standard

1. Place the probe in a conductivity standard that is in theexpected range of the samples. (Choose from the four meterranges.) Agitate the probe to dislodge bubbles in the cell.Avoid resting the probe on the bottom or sides ofthe container.

2. Press CAL. Functional keys will appear in the lower left of thedisplay. CAL, ?, and 1.000 1/cm will appear in the upperdisplay. If the meter has been calibrated, the last calibrationvalue will appear. The numeric keypad will become active.

3. Press the arrow keys to scroll to the factory calibrationoptions (1000 µS/cm or 18 mS/cm). To calibrate using one ofthese standards, press ENTER.

4. If using a standard with a different value, use the numberkeys to enter the standard conductivity at 25 °C, then pressENTER. The meter will automatically correct the calibrationmeasurement to 25 °C using the NaCl-based, non-lineartemperature coefficient.

29


If the standard has a value at 25 °C in the µS/cm range, enterthe value when 1000 µS/cm is displayed. If the standard has avalue at 25 °C in the mS/cm range, enter the value when18 mS/cm is displayed. It is not necessary that all four placeshave a number entered in them. If a number entry erroroccurs, start over by pressing the CE key.

5. When the reading is stable, the calibration is automaticallystored and the instrument returns to reading mode.

3.2.2 Calibrating by Adjusting the Cell ConstantThe Conductivity probe may have slightly different cell constantsdepending on the nature, temperature, and range of the solutionused for calibration.

1. Follow Section 3.2.1 to calibrate the meter. Be sure the meteris in the conductivity measurement mode.

2. After the calibration is complete, press REVIEW. The cellconstant for the probe will be displayed. Record this value.

3. Press the up arrow to display the standard concentrationvalue. Record this value. Press EXIT.

4. As the conductivity of the sample measurements change, thecell constant can be updated without calibrating with astandard. First, press CAL.

5. Functional keys will appear in the lower left part of thedisplay. CAL and ? will appear in the upper display. The maindisplay will show the last value used for calibration.

6. Press the down arrow until the current cell constant isdisplayed (in 1/cm).

7. Use the numeric keypad to enter the cell constant from theprevious calibration. If the range of the samples has changed,use a cell constant from a previous calibration in that range.If a number entry error occurs, clear the entry by pressing CE.

8. Press ENTER. When the calibration is complete, the meterwill return to measurement mode.

30


3.3 Reviewing Calibrations

1. From the reading mode, press the REVIEW key.

2. The meter will display the current cell constant in 1/cm. Pressthe up arrow key once.

3. The display will show the value of the standard used forcalibration. Press the up arrow once.

4. The display will show the time of the most recent calibration.Press the up arrow once.

5. The display will show the date of the most recent calibration.

6. To exit Cal Review mode, press EXIT. To review the standardinformation again, press the down arrow.

3.4 Measuring Total Dissolved SolidsTo determine TDS with the sension7 meter, press the TDS key onthe keypad. The instrument will display the TDS value for thecurrently displayed conductivity measurement.

The standard method to determine TDS (Total Dissolved Solids)is to evaporate the sample to dryness at 180 °C, then weigh theresidue. Another way to estimate TDS is by calculating theconcentration of sodium chloride that would have the sameconductivity as the sample at the same temperature. Thesension7 meter reports a sample’s TDS value in mg/L of sodiumchloride by comparing the sample conductivity and temperatureto data stored in the meter’s memory. Data were obtained fromempirical procedures using sodium chloride solutions.

3.5 Measuring SalinityTo determine salinity with the sension7 meter, press the SAL keyon the keypad. The instrument will display the salinity value forthe sample being measured.

Salinity, a measure of the mass of dissolved salts in a given massof solution, is used to describe seawater, natural, and industrialwaters. Salinity is a relative scale based on a KCl solution. Asalinity value of 35 is equivalent to a KCl solution containing32.4356 g KCl in 1 kg of solution at 15 °C. Salinity is measured

31


in ‰ (ppt—parts per thousand). The meter calculates the salinitybased on the Extended Practical Salinity Scale of 1978, asreferenced in 17th edition of Standard Methods, 25200 B. Theapplicable range is 0 to 42‰ and –2 to 35 °C.

3.6 Measuring ConductivityDetermining conductivity with the sension7 meter is easy; justpress the COND key on the keypad. The instrument will displaythe conductivity value for the sample being measured.

For conductivity, place the probe into the sample and make surethe slot on the end of the probe is totally immersed. Agitate thesample with the probe for 5–10 seconds to remove bubbles thatmay be trapped in the slot.

Table 5 shows the conductivity ranges of common solutions.

3.6.1 Measuring Low Levels of ConductivityWhen the non-temperature corrected conductivity is less than1 µS/cm, the meter automatically uses the temperature correctioncoefficients for pure water for the reference temperature selected(derived from ASTM method D 1125-91, page 253, 1993).

For increased accuracy, Hach recommends using the Low IonicStrength Chamber to prevent gases in the atmosphere fromchanging the conductivity level.

1. Make sure the meter is using the non-linear NaCl temperaturecorrection (see Section 3.1.4 on page 23).

Table 5 Conductivity Range of Common Aqueous Solutions

Sample Type Conductivity Range

High Pressure Boiler Water <0.1 µS/cm to 0.2 µS/cm

Demineralized Water 1 µS/cm to 80 µS/cm

Drinking Water 100 µS/cm to 1 mS/cm

Wastewater 85 µS/cm to 9 mS/cm

Surface Water 100 µS/cm to 10 mS/cm

Industrial Process Water 8 mS/cm to 130 mS/cm

Concentrated Acids and Dyes 85 mS/cm to >1000 mS/cm

32


2. Zero the dry probe by pressing READ and CAL at the sametime. The probe must be dry to obtain a correct value.

3. Calibrate using the 180 µS/cm standard (see Section 3.2.1 onpage 29).

4. Thoroughly rinse the electrode with the sample.

5. Start the sample flow into the LIS chamber. Insert theconductivity probe into the LIS chamber.

6. Wait for a stable conductivity value, then store or recordthe result.

Note: If the non temperature-corrected conductivity of the sampleincreases above 1 µS/cm, the meter will use the temperaturecorrection coefficients for NaCl. This may cause a noticeable jump inthe displayed conductivity reading.

3.7 Operational NotesWhen measuring very low conductivity levels (< 2 µS), protectthe sample from gasses such as ammonia or carbon dioxide.These gasses cause rapid changes in the conductivity when theydissolve into water. To avoid this problem, measure conductivityusing the Low Ionic Strength Chamber.

Pretreat water that is likely to contain high amounts of hydroxides(boiler water) with Gallic Acid Solution. Untreated samples mayresult in falsely high values. To pretreat the sample:

1. Add four drops of Phenolphthalein Indicator Solution tothe sample.

2. Stirring constantly, add Gallic Acid Solution until thepink/red color disappears. The solution will become colorlessif a small amount of hydroxides is present, or it may turnbrownish-yellow if large amounts of hydroxides are present.Adding too much Gallic Acid can increase the conductivity,so add the minimum amount to achieve the color change.

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3.8 Common Conversion FactorsThe sension7 meter converts conductivity readings to TDS andsalinity values at the touch of a key. Table 6 lists more conversionfactors that may be useful.

3.9 Theory of OperationConductivity is the ability of a material to conduct current.Positive and negative ions in a solution will move to theoppositely charged electrode when an electric charge is applied tothe solution, thus conducting current. In addition to the currentapplied, ion movement is affected by the solvent properties(temperature, viscosity) and the physical properties of the ion(size, charge, concentration...). As temperature increases, ionsmove faster and conduct more current. As viscosity increases, theions move slower and conduct less current.

For our purposes, conductivity is measured by placing a cell(probe) in an electrolytic solution. A cell consists of twoelectrodes of a specific size, spaced at a specific distance apart.The conductivity of a liquid is the ratio of current to voltagebetween the electrodes. The conductivity value changes if theelectrodes are spaced closer or further from each other. To haveuseful analyses, the distance between the two electrodes must beconsidered in the conductivity calculation.

In theory, a conductivity measuring cell consists of two 1-cmsquare electrode surfaces spaced 1 cm apart. The cell constant (K)

Table 6 Conversions

To Convert From To Use This Equation

mS/cm µS/cm mS/cm x 1000

µS/cm mS/cm µS/cm x 0.001

µS/cm µmhos/cm µS/cm x 1

mS/cm mmhos/cm mS/cm x 1

g/L TDS mg/L TDS g/L TDS x 1000

mg/LTDS g/L TDS mg/L TDS x 0.001

mg/L TDS gpg TDS mg/L TDS x 0.05842

g/L TDS gpg TDS g/L TDS x 58.42

µS/cm ohms•cm 1,000,000 ÷ µS/cm

mS/cm ohms•cm 1,000 ÷ mS/cm

34


is determined by the cell length (L) and cross-sectional area (A)(K = L÷A). The theoretical cell just described has a cell constantof K = 1.0 cm-1. Cells with larger/smaller electrodes or electrodesspaced at a different distance are characterized by a differentcell constant.

Often, the physical characteristics of a cell are designeddifferently due to sample volume or space. Cells with cellconstants of 1.0 cm-1 or greater normally have small, widelyspaced electrodes. Cells with constants of K = 0.1 cm-1 or lessnormally have large, closely spaced electrodes.

Electrolytic conductivity is not the same as specific conductivity.Electrolytic conductivity is a property of the solution beingmeasured; specific conductivity includes the property of themeasuring cell, partially defined by its physical design. Bydefining the physical parameters of the cell, a standard measure iscreated. This standard measure (specific conductivity) isreciprocal of the resistance (1/ohm), measured between theopposing faces of 1 cm cube of liquid at a specific temperature.The S.I. unit for conductivity is Siemens (S) (1 Siemen = 1 mho).Other units are: 1/ohm = 1 mho = 1000 mS = 1,000,000 µS.

Since the cell’s physical configuration significantly affects theconductivity measurement, it must be multiplied by theconductance to obtain the actual conductivity reading. Forexample, if the conductance reading is 350 µS using a cell withK = 0.1 1/cm, the conductivity value is 350 x 0.1 = 35.0 µS/cm.

Simply stated, the cell constant is defined as the ratio of thedistance between the electrodes (d) to the electrode area (A).However, this neglects the existence of a fringe-field effect,which affects the electrode area by the amount AR. Therefore:

K = d/(A + AR)

Normally it is not possible to measure the fringe-field effect andthe amount of AR to calculate the cell constant. For most uses,the actual cell constant (K) of a specific cell is determined bycomparing the measurement of a standard solution of knownspecific conductivity (e.g., 0.01 M KCl) to themeasured conductance.

35


The conductivity of a solution at a specific electrolyteconcentration will change if the temperature changes. Foraccuracy, measured values should be adjusted for the solutiontemperature. The temperature-compensated conductivity of asolution is the conductivity that the solution exhibits at thereference temperature. This temperature is either 25 °C or 20 °C.A measurement made at reference temperature does notneed compensation.

The sension7 meter automatically compensates for temperatureduring conductivity measurements, using the sample temperature.Temperature compensation is different for different types ofsamples. Some examples are shown in Table 4 on page 24. Thecloser the sample is to the reference temperature, the smaller theerror will be if the meter temperature coefficient is not correct.

36

SECTION 4 STORING AND RECALLING DATA

4.1 Storing MeasurementsThe sension™7 Meter can store up to 99 measurement readings.Data must be stored to recall it later for review, downloading, orprinting. Although the meter display will only show thetemperature, data location, and conductivity (or TDS/salinity)value, the following information is stored and can be downloaded(or printed) for each sample:

The new data is saved in the next available memory location,numbered from 1 to 99. If no memory locations higher than thecurrent one are available, the meter will “wrap around” andchoose the next available location. The user also has the option ofchoosing the storage location.

To store data:

1. Press STORE. The display will prompt Store Sample #? (# isthe next available storage location). The question mark willbe flashing.

2. Press ENTER to store the measurement reading in thatlocation. To store the data in another location, use the arrowkeys to scroll to another location or enter a location using thenumber keys. Press ENTER.

Note: If all memory locations are full, the meter will prompt to overwriteone of the data points by displaying Erase Sample ##? Press ENTERto replace the data in that location with the current data. Press EXITto return to the previous screen without replacing the data.

3. The meter will store the reading and return to Reading mode.

• storage location • sample temperature

• software version • model and serial number

• date • conductivity, TDS, or salinity value

• time

37


4.2 Recalling Stored Data

1. To recall stored data, press the RECALL key while in theReading mode. The screen will display the most recentlysaved measurement data.

2. Use the arrow keys to scroll to the desired storage location.Press RECALL again to allow number entry of a storagelocation. The question mark will flash. Enter the number ofthe desired storage location. Press ENTER to accept thestorage location or EXIT to escape.

3. When recalling is complete, press EXIT to return to theReading mode.

4.3 Erasing Data

4.3.1 Erasing Single Data Points

1. To erase data, it must be recalled first. Press the RECALL keywhile in the Reading mode. See Section 4.2 formore information.

2. When the desired data point is displayed, press ERASE.

3. The meter will display Erase Sample # and a flashing ?. PressENTER to erase the data. The data will disappear.

4. The meter will recall the next stored sample data. There arethree options at this point:

• Press ERASE to erase the displayed data.

• Press EXIT to exit Recall mode.

• Press an arrow key to scroll to other data points.

5. Repeat steps 2-3 for each data point that needs to be deleted.

38


4.3.2 Erasing All Data Points

1. To erase data, it must be recalled first. Press the RECALL keywhile in the Reading mode. See Section 4.2 formore information.

2. When a data point is displayed, press ERASE.

3. Press the up arrow. The meter will display Erase All and aflashing ?. At this point the options are:

• Press EXIT to return to Recall mode without erasing.

• Press the down arrow to return to the single pointerase prompt.

• Press ENTER to erase all data and return to theReading mode.

4. After all the data is erased, the meter will return to theReading mode.

39

40

SECTION 5 MAINTENANCE

5.1 Cleaning the ProbeRinse the probe thoroughly with deionized water betweenmeasurements. This will minimize the buildup of interferingsubstances on the probe element.

If the sample contains oils, grease, or fats, the probe may becomecoated. If this occurs, clean the probe with a strong detergentsolution or dip it in a 1:1 hydrochloric acid solution. Rinsethoroughly with deionized water.

For long term storage, rinse the probe with deionized water andstore dry.

5.2 Meter MaintenanceThe meter is virtually maintenance-free. If the meter gets dirty,wipe the surface with a damp cloth. Use cotton-tipped applicatorto clean or dry the connectors if they get wet.

41

42

SECTION 6 PRINTING/TRANSFERRING DATA

6.1 Connecting to Printers/Computers

6.1.1 Connecting with the RS232 CableThe standard 9-pin RS232 connector on the sension™7 Meterconnects with a 9-pin D-sub connector. A suitable cable is listedunder REPLACEMENT PARTS on page 53.

The RS232 interface output is an 8-bit data word plus one stop bitand no parity with a baud rate of 1200. It can communicate with aserial printer or a serial port on a computer.

6.1.2 Connecting to a PrinterConnecting a serial printer to the meter requires a 9-pin to 25-pinRS232 cable. The cable provides a direct link between theinstrument and the 25-pin connector used for the serial port onmost serial printers. Table 7 shows the proper pin connections for25-pin printer cables. Using cables that do not match the pininformation in the table may cause undesirable operation. Themeter does not need AC power to transfer data to a printer.

Parallel printers require a serial-to-parallel adapter. This allowsthe use of printers that are normally used for IBM-compatibleapplications.

The Citizen PN60 printer requires a special cable to fit into theprinter. This cable is shipped with the printer when ordered fromHach Company.

Table 7 Standard 9-pin to 25-pin Printer Cable

9-pin D Connector Socket Serial Printer 25-pin D Connector, plug

Pin Signal Name Pin Signal Name

2 RXD no connection

3 TXD 3 RXD

4 DTR no connection

5 GND 7 GND

6 DSR 20 DTR

7 RTS no connection

8 CTS 20 DTR

43


Connect the RS232 cable to the sension™7 Meter by lining upthe holes in the cable connector with the pins of the serial port.Gently and firmly push the cable into the meter (see Figure 6).Connect the cable to the printer in the same manner. Once thecommunication link is established, press PRINT to send data tothe computer.

Note: For optimum performance and ESD protection, use a five-conductor shielded cable. Use a metal shell for the printer orcomputer terminal connector, and connect the shield of the cable tothe metal shell and the sleeve (signal ground) of the RS232 plug.

Follow the printer manufacturer’s instructions to configurethe printer for compatibility with the meter.

Figure 6 RS232 Cable Connector

6.1.3 Connecting to a Personal ComputerConnect the meter to a personal computer (PC) with the computerinterface cable (Cat. No. 48129-00) listed underREPLACEMENT PARTS on page 53. The cable provides a directlink between the meter and the 9-pin D connector used for theserial port on most personal computers. If your computer has a25-pin D connector, use a 9-pin to 25-pin adapter (available atmost computer supply stores).

44


Table 8 shows the proper pin connections for 9-pin computercables. Using cables that do not match the pin information in thetable may cause undesirable operation.

Connect the RS232 cable to the meter by lining up the holes inthe cable connector with the pins of the serial port. Gently andfirmly push the cable into the meter (see Figure 6). Connect thecable to the computer in the same manner.

To transfer data, the communication parameters (baud rate, databits and parity) of the meter and the computer must match. Oncethe communication link is established, press PRINT to send data tothe computer.

Use a communications software, such as HachLink™(Cat. No. 49665-00) to collect data from the instrument.HachLink is a Windows-based application that allows a personalcomputer to capture data from several Hach instruments,including the sension electrochemical meters. The captured datacan be stored in a text file as a spread-sheet compatible format ora free-format text. Data captured in the spreadsheet format iseasily transferred into most spreadsheet programs (i.e., Excel®,Microsoft® Works, Lotus® 123) for graphing and reporting.

To install and run HachLink Data Capture, the computer andsoftware must meet the following minimum requirements:

• IBM® PC/AT or compatible with a 386SX processor(16 MHz or better)

Table 8 Standard 9-pin to 9-pin Computer Cable

9-pin D Connector Socket Computer 9-pin D Connector, plug

Pin Signal Name Pin Signal Name

2 RXD 3 TXD

3 TXD 2 RXD

4 DTR no connection ---

5 GND 5 GND

6 DSR no connection ---

7 RTS 8 CTS

8 CTS 7 RTS

45


• 4 megabytes of RAM

• Hard disk drive with 2 megabytes or more of free space

• 3½ inch, 1.44 megabyte floppy disk drive

• VGA graphics with 640 x 480 or higher resolution, 16 ormore colors

• Mouse or other pointing device

• A 9-pin serial port (or 25-pin serial port with 9-pin adapter)

• Windows® 3.1 or later and DOS 3.3 or later

6.2 Sending Data to Printers/Computers

6.2.1 Sending Currently Displayed Data

1. Wait until the display is stable. Press PRINT.

2. The word PRINT will be briefly displayed, then the meterwill return to Reading mode.

3. The print out for data that is printed without being stored willnot have a storage location number.

Note: It is possible to print data before the reading stabilizes. Unstablevalues are noted with an asterisk on the printout.

6.2.2 Sending Recalled Data Points

1. To transfer recalled data, it must be recalled first. Press theRECALL key while in the Reading mode. See Section 4.2Recalling Stored Data on page 38 for more information.

2. When the desired sample data is displayed, press PRINT.

3. Print Sample # and a flashing ? will be displayed.Press ENTER.

4. The word PRINT will be briefly displayed, then the meterwill return to Recall mode.

46


6.2.3 Sending All Stored Data

1. To transfer all data, it must be recalled first. Press theRECALL key while in the Reading mode. See Section 4.2Recalling Stored Data on page 38 for more information.

2. When a data point is displayed, press PRINT. The display willshow Print Sample # ?.

3. Press the up arrow. The instrument will show Print, Sampleand All with the flashing ?. At this point the options are:

• Press EXIT to return to Recall mode without printing.

• Press the down arrow to return to the prompt for printingsingle data points.

• Press ENTER to print all data (data that is displayed but notstored will not be included). The word PRINT will bedisplayed until all the data has been printed. Then the meterwill return to the most recently stored sample data. Press EXITto return to Reading mode or an arrow key to scroll to anotherdata point.

6.2.3.1 Printed Data FormatPrinted data will have the following format:

Tref:= reference temperature in °C; Tc:= temperature compensation in effect;TDS:= TDS calculation scheme in effect; 0.450/cm is the cell constant;881 µS/cm is the non-temperature corrected conductivity for stored salinity

TDS, Salinityor

ConductivityReading*

Units SampleTemperature

AlternateUnits

ReferenceTemperature/Temperature

compensation

Date Time SerialNumber

SoftwareVersion

1 400 uS/cm 13.5 °C 0.450/cm Tref:25 Tc:0.0% 10/03/99 08:30 SI512344577 PX.X

2 557 mg/L 13.5 °C TDS:NaCl 10/04/99 09:11 SI512344577 PX.X

3 0.6 ‰ 13.5 °C 881 uS/cm 10/10/99 12:44 SI512344577 PX.X

4 1284 uS/cm 25.0 °C 0.450/cm Tref:20 Tc:2.00% 10/12/99 23:10 SI512344577 PX.X

5 642 mg/L 25.0 °C TDS:0.500 Tref:20 Tc:2.00% 10/13/99 13:45 SI512344577 PX.X

6 1412 uS/cm 25.0 °C 0.450/cm Tref:25 Tc:NaCl 10/13/99 14:23 SI512344577 PX.X

* Value depends on the mode used to measure the sample. For example, the TDS value will appear inthis column if the meter was in TDS mode during the stored measurement.

47

48

SECTION 7 TROUBLESHOOTING

7.1 IntroductionCorrecting problem conditions with the sension™electrochemical meters is limited to responding to the errormessage displayed. Other problems must be handled by a Hachtechnician at a service center. Refer to REPAIR SERVICE onpage 55. Do not attempt to service the meter as there are nofield serviceable parts. Opening the meter case will void thewarranty.

7.2 Error CodesError codes indicate a functional problem with the meter and/orthe electrode. Error code numbers will appear in the temperaturefield along with other icons. Table 9 describes the possible errorcodes and some possible solutions to eliminate the cause.

Table 9 Error Codes

Error Code Error Name & Display Icons Description

E1 Storage failure Call Hach Service.

E2 Cell constant is out of range. Incorrect standard value was entered or anelectrode malfunctioned. Prepare freshbuffers/standards and repeat calibration.

E3 Probe error The value read will not work in the calibrationalgorithm. Repeat calibration with a new standard.Check electrode.

E6 Conductivity is out of range. Sample conductivity is too high.

E7 Temperature is out of range.ERROR will be displayed.

Sample temperature is too low for salinitymeasurement (less than –2 °C).

E8 Temperature is out of range.ERROR will be displayed.

Sample temperature is too high for salinitymeasurement (greater than 35 °C).

E9 Corrupt data Recalled data had a bad checksum.Call Hach Service.

49


7.3 Meter Service Request Questionnaire

1. What is the complete lot code of the meter and electrode?

2. On what date was the meter purchased?

3. How long has the meter been in use?

4. What types of samples are being tested?

5. What is the temperature of the samples being tested?

6. How often is the meter being used?

7. How is the meter being stored between uses?

8. If the meter has been in use for a while, what maintenancehas been performed?

9. Describe the suspected problem or failure of the meter.

10. Please have your meter, electrode, standards, and thiscompleted questionnaire near the phone before callingtechnical support.

50

GENERAL INFORMATION

51

At Hach Company, customer service is animportant part of every product we make.

With that in mind, we have compiled thefollowing information for your convenience.

52

53

REPLACEMENT PARTS

REAGENTSDescription Unit Cat. No.Gallic Acid Solution.............................................................. 50 mL SCDB.................14423-26Phenolphthalein Indicator Solution...................................... 15 mL SCDB.....................162-36Potassium Chloride, ACS.................................................................. 454 g.....................764-01Sodium Chloride Standard Solution, 1000 mg/L

(1990 ±20 µS/cm, 995 ±5 TDS) .............................................. 100 mL...................2105-42Sodium Chloride Standard Solution, 85.47 mg/L

(180 ±10 µS/cm, 90 ±5 TDS) .................................................. 100 mL.................23075-42Sodium Chloride Standard Solution, 491 mg/L

(1000 ±10 µS/cm, 500 ±5 TDS) .............................................. 100 mL.................14400-42Sodium Chloride Standard Solution, 10246 mg/L

(18000 ±50 µS/cm, 9000 ±25 TDS) ........................................ 100 mL.................23074-42Potassium Chloride Standard Solution,

(53000 µS/cm, 35 ppt salinity)................................................. 500 mL.................27143-49

APPARATUSBeaker, poly, 50 mL .............................................................................each...................1080-41Bottle, wash, 125 mL ..........................................................................each.....................620-14Computer Interface Cable, 9-pin to 9-pin ............................................each.................48129-00Low Ionic Strength Chamber ...............................................................each.................51899-00Power Supply for meter, 115 V............................................................each.................51898-00Power Supply for meter, 230 V............................................................each.................46080-00Probe, Conductivity, cell constant = .45 wire, 1 m cable .....................each.................51975-00Probe, Conductivity, cell constant = .45 wire, 3 m cable .....................each.................51975-03Printer, Citizen PN60I, 115 V, North American plug...........................each.................26687-00Printer, Power Cord, European style for Citizen PN60I printer...........each.................46836-00Printer Interface Cable, 9-pin to 25-pin ...............................................each.................49503-00Software, HachLink™, 3½ in.Disk.......................................................each.................49665-00

HOW TO ORDER

Information Required

Technical and Customer Service (U.S.A. only)Hach Technical and Customer Service Department personnelare eager to answer questions about our products and their use.Specialists in analytical methods, they are happy to put theirtalents to work for you.Call 1-800-227-4224 or E-mail [email protected].

International CustomersHach maintains a worldwide network of dealers and distributors.To locate the representative nearest you, send E-mail tointl@hach. com or contact:

In Canada, Latin America, Africa, Asia, Pacific Rim:Telephone: (970) 669-3050; FAX: (970) 669-2932

In Europe, the Middle East, or Mediterranean Africa:HACH Company, c/oDr. Bruno Lange GmbHWillstätterstr. 11D-40549 DüsseldorfGermanyTelephone: +49/[0]211.52.88.0Fax: +49/[0]211.52.88.231

By Telephone: By Mail:6:30 a.m. to 5:00 p.m. MSTMonday through Friday(800) 227-HACH(800-227-4224)By FAX: (970) 669-2932

Hach CompanyP.O. Box 389Loveland, CO 80539-0389U.S.A.

Ordering information by E-mail: [email protected]

• Hach account number (if available) • Billing address

• Your name and phone number • Shipping address

• Purchase order number • Catalog number

• Brief description or model number • Quantity

54

REPAIR SERVICE

Authorization must be obtained from Hach Company beforesending any items for repair. Please contact the HACH ServiceCenter serving your location.

In the United States:Hach Company100 Dayton AvenueAmes, Iowa 50010(800) 227-4224 (U.S.A. only)Telephone: (515) 232-2533FAX: (515) 232-1276

In Canada:Hach Sales & Service Canada Ltd.1313 Border Street, Unit 34Winnipeg, ManitobaR3H 0X4(800) 665-7635 (Canada only)Telephone: (204) 632-5598FAX: (204) 694-5134E-mail: [email protected]

In Latin America, the Caribbean, the Far East, theIndian Subcontinent, Africa, Europe, or the Middle East:Hach Company World HeadquartersP.O. Box 389Loveland, Colorado, 80539-0389U.S.A.Telephone: (970) 669-3050FAX: (970) 669-2932E-mail: [email protected]

55

WARRANTY

Hach warrants most products against defective materials orworkmanship for at least one year from the date of shipment;longer warranties may apply to some items.

HACH WARRANTS TO THE ORIGINAL BUYER THAT HACHPRODUCTS WILL CONFORM TO ANY EXPRESS WRITTENWARRANTY GIVEN BY HACH TO THE BUYER. EXCEPT ASEXPRESSLY SET FORTH IN THE PRECEDING SENTENCE,HACH MAKES NO WARRANTY OF ANY KIND WHATSOEVERWITH RESPECT TO ANY PRODUCTS. HACH EXPRESSLYDISCLAIMS ANY WARRANTIES IMPLIED BY LAW,INCLUDING BUT NOT BINDING TO ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR A PARTICULARPURPOSE.

LIMITATION OF REMEDIES: Hach shall, at its option, replace orrepair nonconforming products or refund all amounts paid by thebuyer. THIS IS THE EXCLUSIVE REMEDY FOR ANY BREACHOF WARRANTY.

LIMITATION OF DAMAGES: IN NO EVENT SHALL HACH BELIABLE FOR ANY INCIDENTAL OR CONSEQUENTIALDAMAGES OF ANY KIND FOR BREACH OF ANY WARRANTY,NEGLIGENCE, ON THE BASIS OF STRICT LIABILITY, OROTHERWISE.

This warranty applies only to Hach products purchased anddelivered in the United States.

Catalog descriptions, pictures and specification, althoughaccurate to the best of our knowledge, are not a guarantee orwarranty.

For a complete description of Hach Company’s warranty policy,request a copy of our Terms and Conditions of Sale for U.S. Salesfrom our Customer Service Department.

Hach warrants the sension™ meters against defective materialsor workmanship for three years from the date of shipment.

56

CERTIFICATION

Hach Company certifies this instrument was tested thoroughly,inspected and found to meet its published specifications when itwas shipped from the factory.

The sension™7 Conductivity Meter has been tested and iscertified as indicated to the following instrumentation standards:

Product Safety:External Power Supplies Only:115 Vac Supply, UL Listed & CSA Certified or230 Vac Supply, CE Marked per 73/23/EEC, VDE Listed

EMI Immunity:Instrument Tested with the external 230V, 50 Hz Power Supply:

Per 89/336/EEC EMC: EN 61326:1998 (Electrical Equipmentfor measurement, control and laboratory use- EMC requirements)Supporting test records by Hach Company, certified complianceby Hach Company.

Standards include:IEC 1000-4-2:1995 (EN 61000-4-2:1995) Electro-StaticDischarge Immunity (Criteria B)

IEC 1000-4-3:1995 (EN 61000-4-3:1996) Radiated RF Electro-Magnetic Field Immunity (Criteria A, @ 1 V/m)

IEC 1000-4-4:1995 (EN 61000-4-5:1995) Electrical FastTransients/Burst (Criteria B)

IEC 1000-4-5:1995 (EN 61000-4-5:1995) Surge (Criteria B)

IEC 1000-4-6:1996 (EN 61000-4-6:1996) ConductedDisturbances Induced by RF Fields (Criteria A, @ 3 V/m)

IEC 1000-4-11:1994 (EN 61000-4-11:1994) Voltage Dip/ShortInterruptions (Criteria B)

Additional immunity Standard/s include:ENV 50204:1996 Radiated Electro-Magnetic Field from DigitalTelephones (Criteria A, @ 3 V/m)

57

CERTIFICATION, continued

Emissions:Instrument Tested with the external 230V, 50 Hz Power Supply:

Per 89/336/EEC EMC: EN 61326:1998 (Electrical Equipmentfor measurement, control and laboratory use-EMC requirements)Class “B” emission limits. Supporting test records by HewlettPackard, Fort Collins, Colorado Hardware Test Center (A2LA #0905-01), certified compliance by Hach Company.

Standards include:EN 61000-3-2 Harmonic Disturbances Caused by ElectricalEquipment

EN 61000-3-3 Voltage Fluctuation (Flicker) Disturbances Causedby Electrical Equipment

Additional Emissions Standard/s include:EN 55011 (CISPR 11), Class “B” emission limits

CANADIAN INTERFERENCE-CAUSING EQUIPMENTREGULATION, IECS-003: Class “A” emission limits.Supporting test records by Hewlett Packard, Fort Collins,Colorado Hardware Test Center (A2LA # 0905-01), certifiedcompliance by Hach Company.

This Class A digital apparatus meets all requirements of theCanadian Interference- Causing Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes lesexigences du Règlement sur le matériel brouilleur du Canada.

FCC PART 15: Class emission “A” limits.Supporting test records by Hewlett Packard, Fort Collins,Colorado Hardware Test Center (A2LA # 0905-01), certifiedcompliance by Hach Company.

This device complies with Part 15 of the FCC Rules. Operation issubject to the following two conditions:

(1) this device may not cause harmful interference, and (2) thisdevice must accept any interference received, includinginterference that may cause undesired operation.

58

CERTIFICATION, continued

Changes or modifications to this unit not expressly approved bythe party responsible for compliance could void the user'sauthority to operate the equipment.

This equipment has been tested and found to comply with thelimits for a Class A digital device, pursuant to Part 15 of the FCCRules. These limits are designed to provide reasonable protectionagainst harmful interference when the equipment is operated in acommercial environment. This equipment generates, uses, andcan radiate radio frequency energy and, if not installed and usedin accordance with the instruction manual, may cause harmfulinterference to radio communications. Operation of thisequipment in a residential area is likely to cause harmfulinterference, in which case the user will be required to correct theinterference at his own expense. The following techniques ofreducing the interference problems are applied easily.

1. Disconnect the external power supply from the sension7Conductivity Meter to verify that the meter is or is not thesource of the interference.

2. Move the sension7 Conductivity Meter and its power supplyaway from the device receiving the interference.

3. Reposition the receiving antenna for the device receiving theinterference.

4. Try combinations of the above.

59

HACH COMPANYWORLD HEADQUARTERSP.O. Box 389Loveland, Colorado 80539-0389Telephone: (970) 669-3050FAX: (970) 669-2932

FOR TECHNICAL ASSISTANCE, PRICE INFORMATION AND ORDERING:Call 800-227-4224

Contact the HACH office or distributor serving you.www.hach.com [email protected]

In the U.S.A. -Outside the U.S.A. -On the Worldwide Web - ; E-mail -

toll-free

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